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Back the old days, it was common to refer to a memory copy operation as a 'block transfer'. This was sometimes abbreviated as BLT (there's actually a BLT instruction on the PDP-10) and pronounced 'blit'. The term 'blittable' is a useful invention that expresses whether it is legal to copy an object using a block transfer. Sometimes a concept comes up enough that you just need to invent a new word, you know?